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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph and calculations comparing traction requirements for front-wheel and rear-wheel drive vehicles under acceleration.

Identifier  ExFiles\Box 170\3\  img170
Date  4th March 1938 guessed
  
TRACTION
.4
.3
.2
.1

ACCELERATION
0 .1 .2 .3 .4 .5 .6 g.{Mr Griffiths - Chief Accountant / Mr Gnapp}

[Diagram of a car with forces and dimensions labelled]
Labels in diagram: W, Wa{Mr Wallis}, Wb{Mr Brazier/Mr Bell}, h, l, a, b, = (W/g)a

Traction Coeff Required
FRONT DRIVE = a / (f - ah/l)
REAR DRIVE = a / (f + ah/l)

Assumed a/f = .5, h/l = .22
  
  


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